package cn.edu.abtu.config.security.handler;

import cn.edu.abtu.config.redis.RedisService;
import cn.edu.abtu.entity.SysUser;
import cn.edu.abtu.utils.HttpStatus;
import cn.edu.abtu.utils.JwtUtils;
import cn.edu.abtu.utils.LoginResult;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import io.jsonwebtoken.Jwts;
import org.springframework.security.core.Authentication;
import org.springframework.security.web.authentication.AuthenticationSuccessHandler;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.nio.charset.StandardCharsets;

/*
 * 登录认证成功处理器
 * */
@Component
public class LoginSuccessHandler implements AuthenticationSuccessHandler {

    @Resource
    private JwtUtils jwtUtils;

    @Resource
    private RedisService redisService;

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response, Authentication authentication) throws IOException, ServletException {
        // 设置响应的编码格式
        response.setContentType("application/json;charset=UTF-8");
        // 获取输出流
        ServletOutputStream outputStream = response.getOutputStream();
        // 获取当前登录用户信息
        SysUser sysUser = (SysUser) authentication.getPrincipal();
        // 生成token
        String token = jwtUtils.generateToken(sysUser);
        // 设置token签名密钥以及过期时间
        long expireTime = Jwts.parser() //获取DefaultJwtParser对象
                .setSigningKey(jwtUtils.getSecret())
                .parseClaimsJws(token.replace("jwt_", ""))
                .getBody().getExpiration().getTime();
        // 创建登录结果对象
        LoginResult loginResult = new LoginResult(sysUser.getId(), HttpStatus.SUCCESS, token, expireTime);

        // 将对象转换为JSON格式,并消除循环引用
        String result = JSON.toJSONString(loginResult, SerializerFeature.DisableCircularReferenceDetect);

        outputStream.write(result.getBytes(StandardCharsets.UTF_8));
        outputStream.flush();
        outputStream.close();

        // 认证成功,将token信息存储到Redis缓存中
        String tokenKey = "token_"+token;
        redisService.set(tokenKey,token, jwtUtils.getExpiration() / 1000);
    }
}
